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Vacuum Tube - 6CA7, JJ Electronics
The JJ Electronic 6CA7 is a true to form reproduction of a classic tube that will work in most EL34 amps. The 6CA7 is often considered the American cousin to the British EL34. Sonically, this tube is closer to a 6L6 than an EL34 but without the sometimes harsh high end of the 6L6. The JJ 6CA7 offers warm highs with punchy articulate mids and tight lows. Wielding even more power than a KT77, this tube is a great choice for people looking for a change in their EL34 amp’s tone or want to push their levels that much further.
Matched versions of this tube use Apex Matching
Choose burned-in tubes for maximum stability and performance.
RoHS Compliant
| Single or Matched | Our Part Number | UPC/EAN |
|---|---|---|
| Apex Burned-In Matched Pair | T-6CA7-JJ-MPB | 609722148801 |
| Apex Burned-In Matched Quad | T-6CA7-JJ-MQB | 609722148818 |
| Apex Matched Pair | T-6CA7-JJ-MP | 609722127486 |
| Apex Matched Quad | T-6CA7-JJ-MQ | 609722127493 |
| Single | T-6CA7-JJ | 609722127479 |
| Body Height | 100 mm | |
| Cathode Current | 150 mA max | |
| Filament current (If) | 1.5 A | |
| Filament voltage (Uf) | 6.3 V | |
| Grid 2 dissipation (Wg2) | 8 W max | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to plate capacitance (cg1-a) | 1 pF | |
| Grid voltage 1 (Ug1) | 32 V, -100 V min | |
| Grid voltage 2 (Ug2) | 400 V typical, 500 V max | |
| Heater to cathode voltage (Uk/f) | 200 V max | |
| Internal resistance (Ri) | 24 kΩ | |
| Item Diameter | 38 mm | |
| Item Height | 115 mm | |
| Plate (anode) capacitance (ca) | 9 pF | |
| Plate (anode) current (Ia) | 50 mA | |
| Plate (anode) dissipation (Wa) | 25 W max | |
| Plate (anode) voltage (Ua) | 400 V typical, 800 V max | |
| Transconductance (s) | 9.5 mA/V |
| Packaging Dimensions | Single version | 1.6 in. × 1.6 in. × 4.6 in. |
| Apex Matched Pair version | 1.9 in. × 3.3 in. × 4.6 in. | |
| Apex Burned-In Matched Pair version | 4.5 in. × 3.3 in. × 1.8 in. | |
| Apex Matched Quad version | 3.3 in. × 3.3 in. × 4.6 in. | |
| Apex Burned-In Matched Quad version | 4.5 in. × 3.3 in. × 3.3 in. | |
| Weight (Packaging) | Single version | 0.15 lbs. |
| Apex Matched Pair version | 0.3 lbs. | |
| Apex Burned-In Matched Pair version | 0.3 lbs. | |
| Apex Matched Quad version | 0.6 lbs. | |
| Apex Burned-In Matched Quad version | 0.6 lbs. |
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Questions and Answers
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2 answers
I want to try these in a Bugera T50 Infinium. But,I can't seem to find any remarks on the web for this application.
My T50 currently has a pair of the Bugera el34 tubes and I feel it compresses and begins to overdrive a little too soon. In the lead channel it reminds me the Hot Rod Deville "fizz."
I'm looking for more headroom and dimension in my tone. I play mostly R&B styles and a touch of jazz fusion.
Any advice is appreciated.
Bob Herndon
Asked by Anonymous on May 7th, 2016. 1 person subscribed to this question
May 10th, 2016
Staff MemberTop ContributorI would suggest either this tube or the E34L for maximum headroom. This should help a bit with your early breakup. Additionally, with the tubes I mentioned you can always request the highest PC/TC numbers for least breakup.
From what I've been discovering online, the answer to this largely lies with the preamp section, namely the four (4) 12AX7s. I'm changing these to, inline from the guitar input jack (call it V1) all the way over: V1 = 12AY7, V2 = 12AX7, V3 = 12AX7, V4 = 5157. Hopefully by this coming Friday 07/10, I'll have a smoother, more gradual gain, which it's hoped, translates to a more singing, far less crosscut crunch tone in the overdrive channel.
1 answers
I have KT77 apex matched. If I give the ID # can I get these 6CA7's with similar ratings so I can swap the two and not have to re-bias my amp?
Asked by Anonymous on April 25th, 2016. 1 person subscribed to this question
April 27th, 2016
Staff MemberTop ContributorYou can provide the PC/TC numbers and it's possible we could find similar ratings. There is the chance the number scale will differ with different tube types and biasing may still be needed.
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Product Reviews
I just wanted to update my original post. I bought a quad of these JJ 6CA7's for my 50 watt Marshall so I would have a pair on hand when the first pair was used up. I ran the first pair for over two and a half years! One day I noticed a change in the sound; checked the bias and one of the tubes would not give any bias reading at all. Before that they never wavered; sounded great and the bias was always spot on. Two and a half years of life out of power tubes in a Marshall is pretty impressive. I still love these tubes and will be ordering some more now that I finally had to install my backups.
I just put a pair of these in my 73 Marshall after a Winged C EL34 gave it up. I love these new 6CA7's! Low end is tight, nice harmonic content when over driven, and a nice, almost Fender-ish sparkle when you back off guitar volume. Played my first gig with these tubes last night, started off with my volume knobs where I used to set them with EL34's and had to turn down after the first song. I think JJ has a winner with these new tubes, and service and shipping from Amplified Parts stellar as always.